In order to probe a way to transform the lowland secondary forests in themiddle-upper reaches of the Changjiang river and try to find out a synthetical way to evaluate the soil fertility and stand soil growth condition,we have researched into the amount ofsoil microorganisms and the soil enzyme activity of different forest groups in the secondaryforests. The study shows that soil microorganisms are mainly concentrated in the 0-20 cmsoil layer; their amount rapidly decreases with the increase of soil depth; and there is aworld of differences in various forest groups, the number of soil microorg...
